1666685349 has 32 divisors (see below), whose sum is σ = 2832963840. Its totient is φ = 948658176.

The previous prime is 1666685341. The next prime is 1666685351. The reversal of 1666685349 is 9435866661.

It is not a de Polignac number, because 1666685349 - 2³ = 1666685341 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1666685295 and 1666685304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666685341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31417 + ... + 65729.

It is an arithmetic number, because the mean of its divisors is an integer number (88530120).

Almost surely, 2^1666685349 is an apocalyptic number.

It is an amenable number.

1666685349 is a deficient number, since it is larger than the sum of its proper divisors (1166278491).

1666685349 is a wasteful number, since it uses less digits than its factorization.

1666685349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34586 (or 34580 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 1666685349 is about 40825.0578566645. The cubic root of 1666685349 is about 1185.6355315512.

The spelling of 1666685349 in words is "one billion, six hundred sixty-six million, six hundred eighty-five thousand, three hundred forty-nine".